#include <iostream>
#include <string>
#include <cstring>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>

void Usage(const std::string& proc)
{
    std::cout << "\n\rUsage: " << proc << " server_ip server_port\n"
              << std::endl;
}

int main(int argc, char *argv[])
{
    if (argc != 3)
    {
        Usage(argv[0]);
        exit(1);
    }
    std::string serverip = argv[1];
    uint16_t serverport = std::stoi(argv[2]);

    struct sockaddr_in server;
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport);
    inet_pton(AF_INET, serverip.c_str(), &(server.sin_addr));

    int cnt = 5;
    int isreconnect = false;
    int sockfd = -1;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
    {
        std::cerr << "socket error" << std::endl;
        return 1;
    }

    do {
        // tcp客户端需要bing,但不是显示bind
        // 客户端发起connect的时候,OS进行自动随机bind端口
        int n = connect(sockfd, (struct sockaddr*)&server, sizeof(server));
        if (n < 0)
        {
            isreconnect = true;
            cnt--;
            std::cerr << "connect error... reconnect: " << cnt << std::endl;
            sleep(2);
        }
        else break;
    }while(cnt && isreconnect);

    if (cnt == 0)
    {
        std::cerr << "user offline..." << std::endl;
        exit(2);
    }

    std::string message;
    std::cout << "Please Enter# ";
    std::getline(std::cin, message);

    int n = write(sockfd, message.c_str(), message.size());
    if (n < 0)
    {
        std::cerr << "write error..." << std::endl;
    }

    char inbuffer[4096];
    n = read(sockfd, inbuffer, sizeof(inbuffer));
    if (n > 0)
    {
        inbuffer[n] = 0;
        std::cout << inbuffer << std::endl;
    }
    close(sockfd);
    return 0;
}